Controlled maximum product envelope · controlled minimum feature envelope

Socket-Head Screw Envelope Margin Worksheet

Compare documented maximum head dimensions with documented minimum counterbore dimensions while keeping standards, tolerances, material and drawing provenance visible.

No invented ISO tableSigned dimensional marginsNo fit or strength verdict

Arithmetic only—not a fastener selection, machining tolerance or assembly acceptance tool. Enter limit dimensions from the licensed current product standard/manufacturer certificate and the controlled drawing/process capability. The worksheet does not provide ISO 4762 dimensions, choose a property class, calculate mass/torque/strength, specify a counterbore or authorize manufacture.

Controlled product and feature limits

Maximum screw-head diameter d_k,max

Maximum screw-head height k_max

Minimum finished counterbore diameter D_min

Minimum finished counterbore depth H_min

Project / controlled drawing ID

Fastener designation / item ID

Product dimension source / certificate

Standard edition / status / correction record

Verified table / clause / manufacturer row

Thread size, pitch and tolerance class

Length and thread-length configuration

Product grade and dimensional tolerance basis

Material specification

Verified property class / marking

Coating / finish / added-layer allowance

Hex socket size / tool-access record

Counterbore GD&T / datum / minimum limits

Tolerance-chain / thermal / assembly allowance

Manufacturing and inspection capability

Prepared / reviewed by

Record date

Notes and exclusions Optional: head fillet/chamfer, bearing face, washer, socket tool clearance, plating buildup, coaxiality, burrs, measurement uncertainty

The screw limits come from the exact licensed/current standard edition or controlled manufacturer record for this material, property class, coating, size and configuration—not from the former webpage table.
The counterbore inputs are controlled minimum finished-feature limits including drawing tolerances and process effects; they are not a nominal “d_k + 1 mm” guess.
Fillets, chamfers, bearing face, washer/tool access, coaxiality, coating buildup, thermal effects and the complete tolerance chain are checked separately.
Signed margins are arithmetic evidence only; the controlled design authority owns fit, strength, torque, fatigue, manufacture and acceptance decisions.

Signed envelope margins

Diametral margin Dmin − dk,max

—

Nominal radial margin

—

Depth margin Hmin − kmax

—

Normalized head envelope

—

Normalized counterbore envelope

—

Input unit

—

Equation, units and classification

C_d = D_min − d_k,max
C_r = C_d / 2
C_h = H_min − k_max

These are ordinary signed subtractions, not formulas specified by ISO 4762. Positive means the entered minimum feature exceeds the entered maximum rectangular/cylindrical envelope in that one dimension; zero means equality; negative means overlap in that simplified envelope. None is a fit verdict. 1 in = 25.4 mm exactly.

Model boundary and removed unsupported content

No unlicensed ISO dimension table. The former M3–M36 nominal values were labelled ISO 4762 without edition, tolerances, limit status or a verified table. Exact limits are now controlled inputs and remain NEEDS_LICENSED_SOURCE.
No false mass model. The former mass treated the head and shank as solid cylinders and ignored the socket recess, threads, chamfers, fillets, under-head geometry, thread length, tolerance, material/coating and manufacturer mass data.
No universal counterbore d_k + 1 mm. ISO 4762 is a product standard; ISO 273 tabulates general-purpose clearance through holes, not an automatic counterbore design. Feature size is controlled by the drawing and tolerance chain.
No mandatory property class 12.9 claim. ISO 4762 defines product characteristics; official Bossard examples sold to ISO 4762 exist in both property classes 8.8 and 12.9. Material/class/marking must be verified for the actual item.
No claim that ISO 4762 and DIN 912 are identical. Bossard identifies DIN 912 as withdrawn. Interchangeability and tolerances require the exact controlled documents.
No strength/torque selection. ISO 898-1:2013 covers specified carbon/alloy-steel property classes within scope but explicitly does not specify corrosion, shear, torque/clamp-force performance or fatigue resistance.

Source traceability

Claim	Clasificación	Evidence
ISO 4762:2004 Edition 4 covers coarse-pitch hexagon socket head cap screws M1.6–M64, product grade A.	Official ISO public status/scope	ISO 4762:2004; published, confirmed 2023; French corrected version 2024-08
ISO 273:1979 covers fine/medium/coarse general-purpose clearance-hole series; special holes depend on design requirements.	Official ISO public status/scope	ISO 273:1979; confirmed 2024
ISO 898-1:2013 covers mechanical/physical properties of in-scope carbon/alloy-steel fasteners at 10–35 °C but not corrosion, shear, torque/clamp-force performance or fatigue.	Official ISO public scope/exclusions	ISO 898-1:2013 Edition 5; published, confirmed 2025, stage 90.92 to be revised
DIN 912 is withdrawn and commercial ISO 4762 products are offered in more than one property class.	Official manufacturer product records	Bossard BN 3, class 8.8 y BN 7, class 12.9
Cd=Dmin−dk,max; Cr=Cd/2; Ch=Hmin−kmax	General arithmetic; not ISO formulas	Direct dimensional-envelope subtraction shown above

Accessed: 15 July 2026. Public pages establish status/scope/exclusions and manufacturer examples—not the full licensed ISO 4762 dimension/tolerance table or a design decision.

Arithmetic reference example

For d_k,max = 13.0 mm, k_max = 8.0 mm, D_min = 14.0 mm and H_min = 9.0 mm: C_d = 1.0 mm, C_r = 0.5 mm and C_h = 1.0 mm. These input values are an arithmetic benchmark only, not asserted ISO limits or a recommended counterbore.

Questions

Where is the ISO 4762 size table?

The exact table is licensed and was not independently verified from a controlled copy, so it is not reproduced or guessed.

Does a positive margin prove assembly?

No. The simplified envelope omits many geometry, tolerance, process and functional requirements listed above.

Are all ISO 4762 screws class 12.9?

No universal class is inferred here. Verify the actual material specification, property class, marking and certificate.